At the early age of twenty-four, he was appointed by his friend, Lord Cromer, Inspector General of Antiquities for Upper Egypt, a post for which his scholarship, his administrative ability, and his great energy eminently fitted him. This arduous position he held until 1914; and during his tenure of office he carried out the most important reforms with a view to the preservation and safeguarding of antiquities, the suppression of lawless excavation, and the advancement of the science of Egyptology. He was present at most of the great discoveries made during those years, and in particular he supervised the excavations in the Valley of the Tombs of the Kings at Thebes, in which some of the famous royal sepulchres were discovered. Besides his administrative and archæological work he found time to make several daring expeditions into the unexplored regions of the Eastern Desert; and in these years he also wrote a number of Egyptological books, including _A Guide to the Antiquities of Upper Egypt and Lower Nubia_: _Travels in the Upper Egyptian Deserts_: _The Life and Times of Akhnaton, Pharaoh of Egypt_: _The Life and Times of Cleopatra_: etc. He also made a considerable study of the political situation in the Near East; and his book _A History of Events in Egypt from 1798 to 1914_, and various papers in the _Fortnightly Review_, had considerable influence on British policy. For some time, too, Mr. Weigall was a member of the Catalogue Staff of the Cairo Museum, and in that connection wrote an important work of a mathematical character on ancient Weights and Balances. These books, and his many papers in the _Nineteenth Century_, _Fortnightly Review_, _Blackwood’s Magazine_, etc., were received with a chorus of praise; and he was soon recognised as the foremost writer upon Egyptology, and a master of felicitous expression and description. His friend the late President Roosevelt, writing in the _Outlook_, spoke of him as having “that supreme quality of seeing the living body through the dry bones and then making others see it also,” and as being “not merely accurate, but truthful with the truth that comes only from insight and broadminded grasp of essential facts, added to exhaustive study and wide learning.”